Katie Leung and Olivia Colman for Channel 4 drama Run

FORMERHarry Potter star Katie Leung is to line up alongside Olivia Colman for a gritty new Channel 4 drama.

Run will follow the stories of four unconnected people whose lives intertwine in a story of modern-day survival.

Currently shooting in and around London, the drama will see Leung playing an illegal Chinese immigrant hoping to make a life for herself in the UK and Colman as a struggling single parent who gets mixed up in the world of crime.

Leung is hitherto best known for her role as Cho Chang in Harry Potter.

Colman, meanwhile, has a strong body of work behind her and recently received a BAFTA nomination for her work in Twenty Twelve.

Chris Martin, the man behind the BAFTA-nominated Skins and Being Human, will direct each episode, which will focus on a different character each week.